Book Image

Essential Angular

By : Victor Savkin, Jeff Cross
Book Image

Essential Angular

By: Victor Savkin, Jeff Cross

Overview of this book

Essential Angular is a concise, complete overview of the key aspects of Angular, written by two Angular core contributors. The book covers the framework's mental model, its API, and the design principles behind it. This book is fully up to date with the latest release of Angular. Essential Angular gives you a strong foundation in the core Angular technology. It will help you put all the concepts into the right places so you will have a good understanding of why the framework is the way it is. Read this book after you have toyed around with the framework, but before you embark on writing your first serious Angular application. This book covers concepts such as the differences between Just-In-Time (JIT) and Ahead-Of-Time (AOT) compilation in Angular, alongside NgModules, components and directives. It also goes into detail on Dependency Injection and Change Detection: essential skills for Angular developers to master. The book finishes with a look at testing, and how to integrate different testing methodologies in your Angular code.
Table of Contents (11 chapters)

Bootstrap and entry components

The bootstrap property defines the components that are instantiated when a module is bootstrapped. First, Angular creates a component factory for each of the bootstrap components. And then, at runtime, it'll use the factories to instantiate the components.

To generate less code, and, as a result, to produce smaller bundles, Angular won't generate component factories for any components of TalksModule. The framework can see their usage statically, it can inline their instantiation, so no factories are required. This is true for any component used statically (or declaratively) in the template.

For instance, let's look at TalkCmp:

selector: 'talk-cmp',
template: `
{{talk.title}} {{talk.speaker}}
{{talk.rating | formatRating}}
<watch-button [talk]="talk"></watch-button>
<rate-button [talk]="talk">...